PSU made with power op-amp and small trafo - diyAudio
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Old 9th July 2003, 03:34 PM   #1
Join Date: Mar 2003
Location: Lisbon, Portugal
Question PSU made with power op-amp and small trafo

Guys, I've been thinking...
Correct me if I'm wrong (I love to say this ) on my thoughts.

What I have in mind is from a small and cheap transformer (say, 2x24v/1A) make a good PSU for a GC.

The transformer would at the same time supply the power op-amp and the non-iniverting input.
That is, V+ connected to +IN on one power op-amp.
The other one would have the V- connected to +IN.
On the output of one op-amp you would have + voltage, and on the other one you would have the negative.
The voltage would be the same, because an op-amp won't swing more voltage than it has on the PSU supplying it, no matter what gain you configure it.
I was thinking in OPA541, for instance.
It's unity-gain stable.

My doubt, and the question here, is if I would have more current on the output than the current the transformer has (1A).
Wouldn't it be nice to have a 10A PSU (with OPA541) with a 1A transformer?

Am I dreaming?
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Old 9th July 2003, 03:38 PM   #2
tiroth is offline tiroth  United States
diyAudio Member
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
Am I dreaming?
Yup. Nothing is free. Rail sag will limit your current. Of course due to losses it will be even more limited than a passive supply.

You are essentially using the opamp as a regulator.
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Old 9th July 2003, 04:01 PM   #3
Join Date: Mar 2003
Location: Lisbon, Portugal
Talking Thanks tiroth

Thanks for awaking me from a nice dream.
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